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<DIV><FONT size=2 face=Arial>Your statement that any use of rudder or aileron =
no snap is what is wrong. I'm aware that you can snap an airplane simply
by stalling it. I've got a full scale license too. So the key is, the wing
MUST stall. No stall, then no autorotation (the wiffle snap). The
use of rudder is required so that one wing advances and the other retreats
rapidly as the critical angle of attack is reached. This allows you to
control the direction of the snap<FONT size=3 face="Times New Roman">. The
advancing wing tends to not stall, or not stall as deeply as the retreating
wing, which does stall. This is due to the drop in airspeed of the
retreating wing, and to some extent on some airplanes, the blanking effect
of the fuselage on a section of the retreating wing. </FONT></FONT></DIV>
<DIV><FONT size=2 face=Arial><FONT size=3
face="Times New Roman"></FONT></FONT> </DIV>
<DIV><FONT size=2 face=Arial><FONT size=3 face="Times New Roman">Adding ailerons
is necessary on a lot of models because they are so lightly loaded, you can't
get much of a presentable snap without it. It's got to do with how fully
developed the stall is, and since we tend to have a difficult time getting the
kind of potentially life changing stall condition that you can get in a more
heavily loaded airplane, pattern models and IMAC style models tend to need help
with the ailerons so that it doesn't look like a complete train wreck.
Personally, I wish we would just eliminate snaps in precision aerobatics. This
is a never ending debate and a never ending problem with bad
judging.</FONT></FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Ed</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
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<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=rjo626@aol.com href="mailto:rjo626@aol.com">rjo626@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, October 11, 2009 7:46
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] Snap</DIV>
<DIV><BR></DIV>
<DIV> I am not wrong. I've done it. With a tail heavy
airplane with too much elevator throw. Before I knew how to fly, </DIV>
<DIV>my father would hold the radio down so that I could pull the elevator
stick back to do a loop. I pulled back all at</DIV>
<DIV>once instead of gradually. The Sportmaster did a TRUE snap roll in
straight and level flight. Scared the bejeezum</DIV>
<DIV>out of both of us! No aileron; no rudder.</DIV>
<DIV> </DIV>
<DIV> Later!</DIV>
<DIV> RJO</DIV>
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